Silencer



Patented Nov. 30, 1926.

UNITED STATES THOMAS W. ROAGH, OF SEATTLE, WASHII TG'I'OI'I.

SILENCER.

Application filed September 28, 1923 Serial No. 665.439.

My invention relates to a silencer or mutfier intended to be applied either to the suction side of an air compressor, the exhaust of an internal combustion engine, or any similar place where the intake or exhaust of a gas is likely to produce noise.

The object of the device is to suppress or minimize this noise so that it will be unobjectional.

The features of my invention will. be hereinafter described in the specification, and the novel points or those upon which patent protection is desired will be specifically defined in the claims.

In the accompanying drawings I have shown my device in the type of construction which is now preferred by me.

Figure 1 is an end View of the silencer with one of the heads removed.

Figure 2 is side view of the silencer with a portion of one side wall broken away.

I have termed my device a gas silencer. The term gas as therein used is intended to be used in the broadly generic meaning, which includes not only the term gas as specifically employed, but similar elastic fluids such as air. My device is intended to be applied not only to the exhaust or"- gases under pressure, but also to the intakes of gas suction devicesssuch as air compressors.

I employ a casing 1 which in the preferred form of construction is of cylindrical shape. This cylinder has heads 10 and 11, each of which is provided with a pipe connection as 12 and 18. This pipe connection, in the specific construction illustrated, is located towards one side edge of the heads.

The interior of the casing is provided with partitions which form a series of chambers grouped about the central axis or" the cylinder and connected with each other in series by suitable passages. While this is not strictly essential, I prefer in many cases to also divide the casing into sections by a transverse diaphragm 2 which diaphragm is provided with a transfer port or opening 20 through which the gas flows from one end section to the other end section.

Communicating with the inlet opening 12 at the receiving end of the casing, is a chamher 3 formed by a semi-circular partition 30, and a second partition which has a recurved end 81 and a main body 32, the former being substantially parallel with the outer wall of the casing and the latter being approximately diametrical of the casing. The latter portion. 31, however. has a curved section 32 at each end, the curvature being towards opposite sides at opposite ends.

The portion 31 of one partition is spaced from the outer casing sufficiently to form a passage 1, the direction of which is parallel with the outer surface of the casing. Gas entering the chamber 3 is discharged through the passage 4 into the chamber 5. Thr s other chambers, 6. 7 and 8, are employed in the same end section of the casing. These are grouped about the central axis oi the CLSlIlg. A partition spaced away from the partition 32. is employed to form a passage 4.0 through which the flow into the second chamber 6. The partition 50 at the point where the passage i0 discharries into the chamber 6, is bent back rather sharply upon itself and then bent in a curve 51 which eventually merges in a substantially perpendicular direction with the outer casing, the concave side of said curve being towards the chamber 6.: Inwardly of this partition 51 is a second partition 60. this being substantially parallel with the partition 51 and with the following portion of the outside casing, so as to form a passage 41 through which the gas flows out of the chamber 6 into the chamber 7. The partition 32 in its extension past the center of the casing, forms the wall at one side of the chamber 6. Parallel with this and at the side towards the chamber 7, is a partition which is spaced so as to be parallel with approximately one-half of the length of the partition 32. ()pposite the central axis of the casing this partition bends outwardly in approximately a radial direction, forming the extension 71 of this partition which extends to the outer wall of the casing.

These various partitions form a series of alternating and connected chambers and passages through which the gas must flow. In each of these the discharge of the gas into the chamber and the outlet from the same chamber, is in directions which form acute angles with each other, and in which the discharge is of a return flow character. These chambers 5. 6, and 7 may be. called eddy chambers.

I prefer also, although this is not essential in some cases, to have the cross sectional area of the flow passages 40, 41 and 12, of progressively slightly larger area. This is Nov. 30 1926.

S. WlTTE N FUEL FEEDING MACHINE Filed July 15. 1925 4 Sheets-Sheet 1 1+ I IHiIHH inventor SQU/ E W/TTEN 

